List of Half-tone Illustrations 



PACING PAGE 



xliii. Siausuvry's Swi\^r, Uta stansburiana . . . 125 



V^HiTE-BELUED Sv/iPT, Uia symmetrica . 125 



Cl\rk's Sv/ipr, Sceloporus clarkii . .125 



xliv. Common Swift; Fhnce Lizard, Sceluporus undu- 

 laliis. Spiny Swift; Texas Swift, Scehp- 

 oriis spinosiis . . . . .128 



Pacific SwiET, Sceloporus undulalus occidenlalis . 128 



Baj^ded Swift, Sceloporus undulatus consobriniis 128 



xlv. V^ESTER>i Swift, Sceloporus biseriaius . . .129 



Collared Swift, Sceloporus torquaius poinseitii. 



The Finest Species of its Genus. . . .129 



xlvi. Heads of Horned Lizards, Phrynosoma 144 



xlvii. Douglass's Horned Lizard, Phrynosoma doiig- 



lassii . . . . . '45 



Painted Horned Lizard, P. douglassii orna- 



tissimum . . . 145 



Hernandez's Horned Lizard, P. douglassii 



hernandesi . . . . . . '45 



xlviii. DiTMARs's Horned Lizard, Phrynosoma diimarsii . 148 



Mexican Horned Lizard, Phrynosoma orbiculare . 148 



x'ix. Regal Horned Lizard, Phrynosoma regale . 149 



Pacific Horned Lizaro, Phrynosoma coronatum 149 



1. Texas Horned Lizard, Phrynosoma cornutum. 

 Commonest and Most Widely Distributed of 



the Horned Lizards. . . . 1 56 



Ashy Horned Lizard, Phrynosoma calidiarnn: 1 56 



li. Keeled Lizard, Gerrhonoius muKicarinatus 157 

 Long-tailed Example of the Keeled Lizard, 



Gerrhonoius muliicarinatiis 157 



lii. Brown Lizard, Gerrhonoius liocephalus 160 

 King's Lizard, Gerrhonoius kingii. Tiie Most 



Brightly Coloured Member of its Genus. . 160 



liii. Plated Lizard, Gerrhonoius imbricatus . 161 



Glass "SuAKE," Ophisaurus ventralis 16 

 xxvi 



